CN110484681A - A kind of production method of low carbon low silicon aluminium killed steel water - Google Patents
A kind of production method of low carbon low silicon aluminium killed steel water Download PDFInfo
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- CN110484681A CN110484681A CN201810256961.7A CN201810256961A CN110484681A CN 110484681 A CN110484681 A CN 110484681A CN 201810256961 A CN201810256961 A CN 201810256961A CN 110484681 A CN110484681 A CN 110484681A
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- molten steel
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of production method of low carbon low silicon aluminium killed steel water, the cleanliness difference of the low carbon low silicon aluminium killed steel water produced in the prior art using converter smelting and the technical problem that deoxidation is at high cost are mainly solved.The technical solution of the present invention is as follows: a kind of production method of low carbon low silicon aluminium killed steel water, comprising: use top and bottom combined blown converter smelting, the mass percent of metal main material composition is that molten iron 75%~100%, surplus is steel scrap；W in endpoint molten steel [C] and temperature are bessemerized in the control of converter smelting endpoint, detection；It taps immediately after bessemerizing；Molten steel in ladle is transported to Argon station and carries out liquid steel temperature regulation and the regulation of molten steel aluminium content；Weak stirring is carried out to the molten steel for having fed aluminum steel.The cleanliness height of the low carbon low silicon aluminium killed steel molten steel of the method for the present invention production and deoxidation are at low cost.
Description
Technical field
The present invention relates to a kind of production method of aluminum killed steel, in particular to a kind of production of low carbon low silicon aluminium killed steel water
Method belongs to the smelting and continuously casting technical field of steel.
Background technique
The low carbon low silicon aluminium killed steel market demand is very big always, and lot of domestic and international steel mill is all producing, and representing steel grade has
SPHC steel.General SPHC steel requires higher punching formation property, and the demand in market is very big, belongs to low-carbon al-killed
Steel.The deoxidation treatment technique of converter smelting low carbon low silicon aluminium killed steel molten steel is converter tapping alloying process in the prior art
In, 2.4~4.8kg/t of alfer is added, full deoxidation is carried out to molten steel, molten steel aluminium content is 0.015% or more；It feeds at Argon station
Enter aluminum steel, adjusts molten steel aluminium content.There is both sides defect in the technique: first is that tapping process carries out full deoxidation, aluminium to molten steel
The scaling loss of ferroalloy is big, and deoxidation is at high cost.Meanwhile a large amount of oxidations of alfer, a large amount of aluminum oxide is generated, steel is caused
Aluminum oxide content in cinder inclusion is high, and ladle slag Composition Control is difficult, influence in molten steel the floating of aluminum oxide field trash and
Removal, influences product quality, is unfavorable for improving the competitiveness of product；Second is that the aluminium in molten steel is very active, it is oxidized easily, steel
In Argon station Argon processing adjustment temperature, the aluminium content variation in molten steel is unfavorable for the accurate control of aluminium component, causes water greatly
Argon station process cycle extends, and influences the release of production capacity.
Chinese patent CN102634641A discloses " converter tapping deoxygenation of liquid steel method ", and which disclose converter tappings
Before, it is added into ladle by carbon dust, SiC and CaC2Mixed 1.75~4.0kg/t of pre-deoxidant, 1660~1700 DEG C of converter
Under the conditions of tap, Si-Al-Ba-Ca or 0.5~2.5kg/t of ferro-aluminum deep deoxidation agent are added in tapping process.Add before tapping into ladle
Enter carbon dust, SiC and CaC2Mixed pre-deoxidant has certain security risk, and high tapping temperature makes the consumption of alfer
Amount is big, and uneconomical.
Chinese patent CN103614517A discloses " a kind of Low-cost deoxygenation method of low-aluminum medium-carbon steel ", the patent disclosure
For converter terminal Oxygen Content in Liquid Steel 0.04% hereinafter, the additional amount of converter aluminium is 0.3~1kg/t, LF furnace disposably mends hello aluminium
The aluminium content of line 0~1.5m/t, LF furnace terminal is within 0.015%.SPHC steel belongs to carbon aluminium-killed steel, and converter terminal oxygen contains
Amount is generally 0.04% or more, and finished product aluminium is generally 0.015% or more, and skyrocketing with electrode price, and LF furnace is processed into
This height.
The high production cost of low carbon low silicon aluminium killed steel water in the prior art.
Summary of the invention
The object of the present invention is to provide a kind of production methods of low carbon low silicon aluminium killed steel water, mainly solve in the prior art
Using the cleanliness difference of the low carbon low silicon aluminium killed steel water of converter smelting production and deoxidation technical problem at high cost；Side of the present invention
Method, realizes the raising of low carbon low silicon aluminium killed steel water cleanliness and deoxidation cost is greatly reduced.
The technical solution adopted by the present invention is that: a kind of production method of low carbon low silicon aluminium killed steel water, comprising the following steps:
1) top and bottom combined blown converter smelting is used, the mass percent of the raw material composition of investment metal major ingredient is molten iron 75%
~100%, surplus is steel scrap；
2) control of converter smelting endpoint, sample detection are bessemerized w in endpoint molten steel [C] and liquid steel temperature, are detected
Bessemerize w in endpoint molten steel [C] >=0.04%, bessemerize endpoint molten steel temperature be 1620~1660 DEG C when, bessemerize
Terminate；
3) tap immediately after bessemerizing, converter tapping process ladle bottom blowing argon gas, argon flow be 15~45 liters/
Hour, when the molten steel amount of converter tapping reaches the 25%~35% of molten steel total amount, aluminium is first added at one time in molten steel into ladle
Ferroalloy, manganeisen carry out into deoxidation and initial adjustment molten steel composition molten steel；Then into ladle in molten steel be added quick lime and
Low carbon low silicon double deoxidizer modifies ladle slag, and free oxygen content is 20~100ppm, control in molten steel in control ladle
W (CaO)/w (Al in ladle slag processed2O3) value be 1.0~1.5；The additional amount of manganeisen by production molten steel target component and
It determines；The additional amount of alfer is 1.6~3.0 kg/ton of steel, and the weight percent of alfer chemical component is Al
50%~60%, Fe 40%~50% and other≤4%；The additional amount of quick lime is 1.2~1.8 kg/ton of steel, quick lime
The weight percent of chemical component is CaO >=90%, SiO2≤ 3.5% and scaling loss be not more than 5%；Low carbon low silicon double deoxidizer
Additional amount be 0.5~1.0 kg/ton of steel, the weight percent of low carbon low silicon double deoxidizer chemical component be Al 26%~
30%, Al2O340%~50%, CaO 15%~25%, SiO2≤ 10% and H2O≤1%；
4) molten steel in ladle is transported to Argon station and carries out liquid steel temperature regulation and the regulation of molten steel aluminium content, the molten steel in ladle
After transporting Argon station, first be passed through in molten steel into ladle argon gas stir molten steel 3.0~3.5 minutes, control argon flow be 20~
30 ls/h；Then free oxygen content and liquid steel temperature in ladle molten steel are detected；Measuring temp of molten steel after determining oxygen, regulates and controls molten steel
Temperature is 1600~1615 DEG C, and aluminum steel is fed into molten steel and carries out aluminium deoxidation to molten steel, regulates and controls in molten steel aluminium and oxygen element to mesh
Ingredient is marked, control argon flow is 20~30 ls/h；
5) weak stirring is carried out to the molten steel for having fed aluminum steel, control argon flow is 20~30 ls/h, when weak stirring molten steel
Between 5~8 minutes, obtain qualified molten steel；The weak stirring refers to that molten steel exposed surface is not more than 200mm during Argon.
In step 4) of the present invention, the additional amount of aluminum steel is 14 × ([%O]+[%Als]), and unit is kg/ton steel, [%
O] weight percentage of molten steel free oxygen when being into Argon station, [%Als] is that the weight percent of dissolved aluminum in finished product molten steel contains
Amount.
The present invention has following good effect compared with prior art: 1, the present invention is by reducing the aluminium in converter tapping process
Ferroalloy additional amount reduces the scaling loss of alfer, reduces deoxidation cost, and ton steel aluminium cost reduces by 3~8 yuan.Meanwhile having
Conducive to the Composition Control of ladle slag, w in ladle slag (CaO)/w (Al can control2O3) value be 1.0~1.5, be conducive to adsorb
Field trash in molten steel improves Cleanliness of Molten Steel, can control middle packet molten steel total oxygen content no more than 25ppm.2, the present invention is logical
Cross control into Argon station molten steel free oxygen content be 20~100ppm, may make the aluminium content in molten steel in 50ppm hereinafter, Argon
Stand adjustment liquid steel temperature when, the scaling loss of aluminium can be effectively prevented from；Meanwhile the recovery rate of Argon station feeding aluminum steel is highly stable, 1 time
Aluminum steel qualification rate height is fed, the secondary oxidation field trash of molten steel can be effectively reduced and reduces the process cycle at Argon station.
Specific embodiment
With reference to embodiment, the present invention is furture elucidated, it should be understood that following specific embodiments are only used for
It is bright the present invention rather than limit the scope of the invention.
The embodiment of the present invention, with 250 tons of top and bottom combined blown converter smelting low carbon low silicon aluminium killed steel water, wherein embodiment 1,2
Smelting steel grade is SPHC, and it is DC51D+Z that embodiment 3,4, which smelts steel grade, and converter steelmaking process bottom blown gas is argon gas；Production
Method, comprising: converter smelting, Argon station steel treatment.The control parameter of molten steel of embodiment of the present invention production is shown in Table 1 to table 6.
1 converter smelting metal charge parameter of the embodiment of the present invention of table
2 converter smelting endpoint molten steel ingredient of table and temperature
3 converter tapping process alloy of table and supplementary product onsumption parameter
Enter the station molten steel composition and temperature at table 4 Argon station
5 Argon station process parameters of table
The outbound molten steel composition in 6 Argon station of table and temperature
The present invention controls and contains into Argon station molten steel free oxygen by reducing the alfer additional amount in converter tapping process
Amount is 20~100ppm.As shown in the embodiment of the present invention 1~4, compared with the prior art, ferro-aluminum is greatly reduced in the method for the present invention
The scaling loss of alloy, reduces deoxidation cost, and ton steel aluminium cost averagely reduces by 5.4 yuan；It, can be effective when Argon station adjusts liquid steel temperature
Ground avoids the scaling loss of aluminium, reduces the secondary oxidation field trash of molten steel, and packet molten steel total oxygen content is not more than 25ppm, decline in control
5ppm；The fluctuation of molten steel aluminium component is reduced, the process cycle 4.3min at Argon station is reduced.
Claims (2)
1. a kind of production method of low carbon low silicon aluminium killed steel water, characterized in that the method the following steps are included:
1) use top and bottom combined blown converter smelting, investment metal major ingredient raw material composition mass percent be, molten iron 75%~
100%, surplus is steel scrap；
2) control of converter smelting endpoint, sample detection bessemerize w in endpoint molten steel [C] and liquid steel temperature, detect converter
W [C] >=0.04% in blowing end point molten steel, when to bessemerize endpoint molten steel temperature be 1620~1660 DEG C, end is bessemerized；
3) tap immediately after bessemerizing, converter tapping process ladle bottom blowing argon gas, argon flow be 15~45 liters/it is small
When, when the molten steel amount of converter tapping reaches the 25%~35% of molten steel total amount, ferro-aluminum is first added at one time in molten steel into ladle
Alloy, manganeisen carry out into deoxidation and initial adjustment molten steel composition molten steel；Then quick lime and low is added in molten steel into ladle
The low Si compound deoxidizer of carbon modifies ladle slag, and free oxygen content is 20~100ppm, control in molten steel in control ladle
W (CaO)/w (Al in ladle slag2O3) value be 1.0~1.5；The additional amount of manganeisen is true by the target component of production molten steel
It is fixed；The additional amount of alfer is 1.6~3.0 kg/ton of steel, and the weight percent of alfer chemical component is Al 50%
~60%, Fe 40%~50% and other≤4%；The additional amount of quick lime is 1.2~1.8 kg/ton of steel, quick lime chemistry
The weight percent of ingredient is CaO >=90%, SiO2≤ 3.5% and scaling loss be not more than 5%；Low carbon low silicon double deoxidizer adds
Entering amount is 0.5~1.0 kg/ton of steel, the weight percent of low carbon low silicon double deoxidizer chemical component be Al 26%~
30%, Al2O340%~50%, CaO 15%~25%, SiO2≤ 10% and H2O≤1%；
4) molten steel in ladle is transported to Argon station and carries out liquid steel temperature regulation and the regulation of molten steel aluminium content, molten steel is transported in ladle
Behind Argon station, first be passed through in molten steel into ladle argon gas stir molten steel 3.0~3.5 minutes, control argon flow be 20~30 liters/
Hour；Then free oxygen content and liquid steel temperature in ladle molten steel are detected；Measuring temp of molten steel after determining oxygen, regulates and controls liquid steel temperature
Be 1600~1615 DEG C, aluminum steel fed into molten steel, aluminium deoxidation is carried out to molten steel, regulate and control in molten steel aluminium and oxygen element to target at
Point, control argon flow is 20~30 ls/h；
5) weak stirring is carried out to the molten steel for having fed aluminum steel, control argon flow is 20~30 ls/h, the weak stirring molten steel time 5
~8 minutes, obtain qualified molten steel；The weak stirring refers to that molten steel exposed surface is not more than 200mm during Argon.
2. a kind of production method of low carbon low silicon aluminium killed steel water as described in claim 1, characterized in that in step 4), aluminium
The additional amount of line is 14 × ([%O]+[%Als]), and unit is kg/ton steel, the weight of molten steel oxygen when [%O] is into Argon station
Percentage composition, [%Als] are the weight percentage of dissolved aluminum in finished product molten steel.
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| CN201810256961.7A CN110484681A (en) | 2018-03-27 | 2018-03-27 | A kind of production method of low carbon low silicon aluminium killed steel water |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111004890A (en) * | 2019-12-03 | 2020-04-14 | 张家港荣盛特钢有限公司 | Method for improving quality of low-carbon silicon killed steel in refining and smelting |
| CN112094987A (en) * | 2020-10-14 | 2020-12-18 | 马鞍山钢铁股份有限公司 | Method for controlling carbon content of molten steel |
| CN112267000A (en) * | 2020-10-20 | 2021-01-26 | 新疆八一钢铁股份有限公司 | Short-flow process for producing low-carbon low-silicon aluminum killed steel |
| CN112553410A (en) * | 2020-11-24 | 2021-03-26 | 本钢板材股份有限公司 | Silicon deoxidation process for RH variety steel |
| CN112961960A (en) * | 2021-02-03 | 2021-06-15 | 重庆钢铁股份有限公司 | Technological method for improving abnormal condition of tapping slag |
| CN113913580A (en) * | 2020-07-10 | 2022-01-11 | 上海梅山钢铁股份有限公司 | Production method of ultralow-carbon low-aluminum structural molten steel |
| CN113981302A (en) * | 2020-12-24 | 2022-01-28 | 天津荣程联合钢铁集团有限公司 | Aluminum-containing low-carbon steel and preparation process thereof |
| CN114150101A (en) * | 2020-09-07 | 2022-03-08 | 上海梅山钢铁股份有限公司 | Method for producing electroplated tin substrate steel by using ladle casting residual molten steel |
| CN114395658A (en) * | 2022-03-02 | 2022-04-26 | 重庆钢铁股份有限公司 | Low-silicon hot coil Q195 molten steel castability control method |
| CN114480946A (en) * | 2020-11-12 | 2022-05-13 | 上海梅山钢铁股份有限公司 | Production method of low-aluminum peritectic steel molten steel |
| CN115044739A (en) * | 2022-05-24 | 2022-09-13 | 柳州钢铁股份有限公司 | Method for quickly and accurately controlling aluminum under ultra-short process technology |
| CN115747407A (en) * | 2022-12-13 | 2023-03-07 | 德龙钢铁有限公司 | Low-silicon aluminum killed low-carbon steel smelting method with controllable inclusions |
| CN116479313A (en) * | 2023-04-24 | 2023-07-25 | 广东中南钢铁股份有限公司 | Sulfur-containing aluminum-containing steel and preparation method and application thereof |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111004890A (en) * | 2019-12-03 | 2020-04-14 | 张家港荣盛特钢有限公司 | Method for improving quality of low-carbon silicon killed steel in refining and smelting |
| CN113913580B (en) * | 2020-07-10 | 2022-10-14 | 上海梅山钢铁股份有限公司 | Production method of ultralow-carbon low-aluminum structural molten steel |
| CN113913580A (en) * | 2020-07-10 | 2022-01-11 | 上海梅山钢铁股份有限公司 | Production method of ultralow-carbon low-aluminum structural molten steel |
| CN114150101A (en) * | 2020-09-07 | 2022-03-08 | 上海梅山钢铁股份有限公司 | Method for producing electroplated tin substrate steel by using ladle casting residual molten steel |
| CN112094987A (en) * | 2020-10-14 | 2020-12-18 | 马鞍山钢铁股份有限公司 | Method for controlling carbon content of molten steel |
| CN112267000A (en) * | 2020-10-20 | 2021-01-26 | 新疆八一钢铁股份有限公司 | Short-flow process for producing low-carbon low-silicon aluminum killed steel |
| CN114480946A (en) * | 2020-11-12 | 2022-05-13 | 上海梅山钢铁股份有限公司 | Production method of low-aluminum peritectic steel molten steel |
| CN112553410A (en) * | 2020-11-24 | 2021-03-26 | 本钢板材股份有限公司 | Silicon deoxidation process for RH variety steel |
| CN113981302A (en) * | 2020-12-24 | 2022-01-28 | 天津荣程联合钢铁集团有限公司 | Aluminum-containing low-carbon steel and preparation process thereof |
| CN112961960A (en) * | 2021-02-03 | 2021-06-15 | 重庆钢铁股份有限公司 | Technological method for improving abnormal condition of tapping slag |
| CN114395658A (en) * | 2022-03-02 | 2022-04-26 | 重庆钢铁股份有限公司 | Low-silicon hot coil Q195 molten steel castability control method |
| CN115044739A (en) * | 2022-05-24 | 2022-09-13 | 柳州钢铁股份有限公司 | Method for quickly and accurately controlling aluminum under ultra-short process technology |
| CN115747407A (en) * | 2022-12-13 | 2023-03-07 | 德龙钢铁有限公司 | Low-silicon aluminum killed low-carbon steel smelting method with controllable inclusions |
| CN115747407B (en) * | 2022-12-13 | 2023-12-15 | 德龙钢铁有限公司 | Smelting method of low-silicon aluminum killed low-carbon steel with controllable inclusions |
| CN116479313A (en) * | 2023-04-24 | 2023-07-25 | 广东中南钢铁股份有限公司 | Sulfur-containing aluminum-containing steel and preparation method and application thereof |
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